Lamp-focusing device



J. L. MINICK.

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Patented Dec. 13, 192i.

2 SHEETS-SHEET l.

SQ Mhw m m,

NNIINNI J. L. MINICK.

LAMP Focusmc; DEVICE.

APPLICATION FlLED FEB.`19|1920.

2 HEETs-sHEET 2.

UNITE STATES LlE-FOCUSING DEVICE.

iai-.coser i Specification of Letters Eatent.

atented Dec. 13, 1921.

Application led February 19, 1920. Serial No. 359,950.

To all w fiom if may concern.

Be it known that JUDD L. Minion, e citizen of the United States, and aresident of Altoona, in the county of Blair and State of Pennsylvania,have invented certain. new and useful improvements in Lamp-FocusingDevices; and I do hereby declare the tollowing to be a full', clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to improvements in lamp focusing devices.

ln the ordinary manufacture of reflectors, lenses, lamps and parts formounting, there is liable to be imperfections which will interfere withand in tact prevent accurate alinement of the source of light with thecenter or i'ocal point of the reflector, unless some means be providedfor effecting accurate adjustment of the parts after they shall havebeen assembled, and hence to obtain the highest elliciency, it isessential that accurate adjustment be. made and maintained.

One object of my present invention is to 'provide simple and ellicientmeans whereby the source oi light (an electric or other type oi lamp)may be accurately adjusted so that the center of the light source shallbe set and maintained at the focal point of the rerlector or lens as thecase may be.

lilith this and other objects in view, the invention consists in certainnovel features oit construction and combinations ot parts as hereinafterset Forth and pointed out in the claims.

ln the accompanying drawings: Figure l is a sectional view, partly insection, showing an embodiment of my invention; Fig, Q is a sectionalview on the line ot' Fig. l; Fig. 3 is a front elevation otl theframework and clamping device applied thereto; Fig. l is a sideelevation ot the, structure shown in Fig. fl: Fig. 5 is a sectional viewoi thc shell ll: Fig. 6 is a view of one ot' the meinbers oi thecylinder l1 Fig. T a` view ol one oil the nieinbersot the eccentric T;llig. 8 is a sectional view ot' the nut 20; Fig. 9 is an end view of thecylinder segment shown iii llig. ll: `Fig. l() is an end view oi theeccentric segment shown in Fig. T. and llig. ll is a diagrammatical viewillustrating the method oi securing both vcitical and transverseadliustment ol the light source.

l represents a Jframe or support compris# ing a pedestal 2 having anenlarged upper end 3 providing a curved seat on which the lamp holdingand adjusting devices are mounted, and an upright il having an annularupper end portion 5 which serves as slipporting means for a reflectorindicated by dotted lines at 6. YWhile l have shown the parts 4,5 as aconvenient means for supporting a reflector, it will be understood thatif a lens be employed instead o'f a reflector, or it my innnovedfocusing means he used for a motion picture machine, the parts el and 5would be omitted.

An eccentric sleeve T, viz., a sleeve having an eccentricbore,comprising two or more segments is supported on the curved seat atthe upper end ol the pedestal 2, and the eccentric sleeve is provided atone end with a knurlcd annular head l() to facilitate manipiilation oithe saine. Instead or making the sleeve T in separato relatively movablesections, it may be made in a single piece instead so as to providerelatively movable portions. It desired, the two segments composing theeccentric sleeve T may be connected by loosely litting dowels 8 (Figs. 7and l0) and said sleeve may be made with peripheral grooves l) toreceive. lianges 9 at the Lipper enlarged end ot the` pedestal. butthese ifeatures of construction may be modified or omitted withoutdeparting from the spirit of my invention.

il. cylinder ll is mounted to turn in the eecentric sleeve T and isprovided at one end with an annular flange l2 overlying one end ot thesleeve 7: the other end ot said cylinder being made with an annularknurled l ad i3 which occupiesl a position near the liiiui'lcd head l()ol' the eccentric sleeve. rllhis cylinder may be made in separatorelatively n'iovable sections or it may be uiade iii a singlo piece andsplit to provide relatively movable portions.

l'lounted within the cylinder ll. is a shell 'll- (which may be split toprovide relatively movable portions) and one end ot' said shell providedwith an annular enlargement l5 provided with projections lll atdiametrically opposite points and these projections einer longitudinalgrooves 1T in the inner wail o'l` the cylinder ll. The cylinder 1l isalso provided ncai' one ende-viz. within the annular head 11h-with acircular groove lo which receives an annular flange 19 on a nut 20, thelatter entering one end of said cylinder and having a kiiuiled part 2ldisposed adjacent to the liniirlcd head 13 of the cylinder. The nut 2Ois made with a threaded bore to receive a threaded shank 2:2, 4thelatter being rigidly secured to a socket piece 23. The socket piece 23passes through the split shell 14, andis made rigid therewith by meansof a set screw 23 or in any( pher suitable manner. The socket piece mayproject outwardly beyond the shell 14 and through the annular portion 5ofthe `tramework, to receive and support a lamp 24.

In the drawings, l have illustrated my improvements as applisable toruse as a locomotive head-light, and have illustrated an incandescentelectric lamp as thesource ot light, but it is evident that m vinvention is equally well adaptable for use on automobiles or othervehicles and that lamps, other than electric lamps might be employed.

A flexible metallic band Q5 (which may be termed a brake or,clampingband) embracesy the eccentric sleeve 7 between the grooves 9 and isrigidly secured near one end to the enlarged upper end l ol' thepedestal or base 2,,the other end of said band having secured thereto, athreaded rod 26 which passes t'reely through an opening 2T in thepedestal or support- 2 and receives a nut QH. This nut is provided wit-ha partly spherical portion 281! which is seated within a similarlyshaped recess Q9 in a boss 29 on the pedestal -or support, and thus thethreaded rod 26 is permitted to seek and maintain proper alinement.

.lf the lamp be properlyY made and screwed home in the socket piece, thelongitudinal axis of the light Source will `-be caused to coincidewiththe line .ir-.vu Fig. 1 which, by properly adjusting the lampfocusing device, will bc made to coincide with the longitudinal axis oi'the reflector.

It' the nut 2() be turned, the shell ll in which the socket piece. 23 issecured, will be moved longitudinally along the axis .1'-.z',- the pillsor projections 16 moving in the grooves 17 preventing ittrom rotatingabout its axis,-and thus longitudinal adjustment oi the source of lightmay be effected.

The diagram, Fig. ll, indicates a diagrami'natic transverse sectionthrough the cylinder vl1 and the eccentric sleeve T, the part :I: beingthe projection of the axis .1v- .0 oi Fig. l.

1i' the lamp were perfectly made and screwed home in the socket piece23, the longitudinal axis of the light source would coincide with thelongitudinal axis of the reflector and hence vertical and transverseadjustment of the lamp would be unnecessa ry, but lamps, sockets andother parts are not perfectly made and the center of the light sourcewill not usually fall upon the point a,',-hence provision for suchadjustira-nts must be made, and this is accomplished by my improvements.

For thepurpose of illustration, let it be.

ysource falls at the point la and that assumed. that when the lamp isscrewed home in the socket, the center et the iight is desired 'to soadjust the lamp as to cause the point L to coincide with the point"ig-3." if the cylinder 'll be turned about its axis, the point L willdescribe a segi'nent terminating at lill if the eccentric sleeve l beturned about its axis, the point M will mark the segment, terminating atif l` l this particular instai1ee,then, all that is necessary to be donein order to cause the point L to coincide with the point af is to turathe cylinder 1l until the point lf coincidesV with `the point MQ andthen turn the eccentric sleeve until the point lil coincides with thepoint an lVhen the lamp shall have been properly adjusted, the l)artswill be clamped with the use of the clampingl band 25 and the adjustmentof the lamp will be niaintained. it may be explained that slight tensionon the band will cause the eccentric sleeve T to be clamped, while thecylinder ll. shell ll and nut 2O may remain tree to adjust. .kdditionaltension on the clamping band Q5 will lock the cylinder l1 in addition'to the eccentric sleeve l', while turtlier tension on said band willclamp or lock all the parts securely together. The reverse action willtake place, when the mit 28 tor the clamping band is unscrewed.

The term relatively movable portions" as applied to the sleeve cylinder'll and shell ll, is intended to comprehend Kthe making of each or anyol' these members in' separate segments or in making each or any ot saidmembers in a single piece and split or slotted.

`Various changes might be made in the details ot' construction ot' myinvention without departing trom the spirit thereol2 or limiting itsscope and hence l do not wish to restrictmyself to the precise detailsherein set t'orth except as specified in the claims.

Having fully described my invention, what .l claim as new and desire tosecure by Letterslatent iszl. ln 'tot-using means, the combination witha support. ot a sleeve having an eccent 'ic bore and comprisingrelatively movable port-ions mounted on said support, a cylindeiFmounted in the eccentric bore ot said sleeve and having relativelymovable portions. holder longitudinally movable in said cylinder, a lampsocket secured to said holder, and means 't'or se 4airing the parts inadjusted position.

l2. In focusing means, the combination with a support, of a sleevehaving an eccentric bore and having relatively movable parts` revolublymounted en said support, a cylinder revolubly mounted in 'the eccentricbore o't said sleeve and having relatively movable portions, means for.holding a lam;`4

tric bore, revolubly mounted on saidsupport, said sleeve comprising aplurality of relatively movable portions, a cylinder revoiubly mountedin the eccentric bore of said sleeve, said cylinder comprising aplurality of relatively movable portions, means for hoiding a lampsupport in said cylinder, a clamping band secured to said irst-mcntiened support and embracing said sleeve, and means for tightening andloosening said band.

4:. In iocusing` means, the combination `with a support, of a sleevehaving anI eccentric bore, revolubly mounted on said support, a cylinderrevolubly mounted in the eccentric bore of said sleeve, a shelllongitudinaliy movable in said cylinder, means for preventing rotationof said shell relatively to the cylinder, a lamp support held in said lsheil and provided with a threaded shank, a

nut revolubly connected with said cylinder and threaded on Asaid shank,and means`for holding said sleeve and' cylinder,` in adjustedpositior'iE 5. in focusing means, the combination with a support, of asleeve havingman eccentric bore, revolubly mounted on said support andcomprising relatively movable portions, a cylinder revolubly mounted inthe bore Yer said sleeve and comprising relatively movable portionsgashell mounted to move iongitudinally in said cylinder andcomprisrelatively movable portions, a lamp older entering said shellandproxzided with a shank, means engaging said shank for effecting'longitudinal adjustment of the shell, lamp holder and the lamp carriedby the latter, and means for holding the parts in adjusted position.

6. In focusing), means, the combination with a support, oi' a sleevehaving an eccentric bore, revolubly mounted on said support andcomprisingr relatively movable portions, a cylinder mounted in theeccentric bore of said sleeve and comprising' relatively movableportions, said cylinder having internal longitudinal grooves and aninternal circulaigroove, a shell comprisingrelativel)v movableportions.enteringl said cylinder, projections on said shell movable. in thelongitudinal grooves in the cylinder, a' nut having an annular flangemovable in the circlilal' groove in said cylinder, a lamp holder held insaid shell and provided with a shank threaded through said nut. and aclamping band secured to said support, embracingV said sleeve v andadjustably connected with said support.

7. in a focusingv means, thc combination .with a Support provided u'itha part havingr a partly spherical socket, ot' a sleeve having aneccentric bore, rcvolubly mounted on said support, a cylinder revolublymounted in the eccentric bore of said sleeve, means for holding a lampsupport in said cylinder, a clamping band embracing said sleeve andsecured atene end to said first-mentioned support, a threaded rod fixedto the other end of said band and passingr through the socketed part ofthe Erst-mentioned support, and a nut on said rod having a partlyspherical part seated in said partly spherical socket.

In testimony whereof', I have signed this Especification in the presenceoi two subscrib ing Witnesses.

JUDD L. MNICK. lVitnesses JAMns T. HANLoN, S. M. VIELE.

